312 in words

312 is written "three hundred twelve". British English inserts "and" before the final part, giving "three hundred and twelve"; American English leaves it out.

Where each word comes from

The same number, other ways

In words (US)

Three hundred twelve

In words (UK)

Three hundred and twelve

Ordinal

312th — three hundred twelfth

Roman numeral

CCCXII

Digits

312

Writing it on a cheque

On a cheque the amount line reads "Three hundred and twelve and 00/100" — or "Three hundred and twelve only" in Indian and much of Commonwealth practice. The fraction or the word "only" exists to stop anyone appending digits after what you wrote. Draw a line through any space left over for the same reason.